Aminobenzoylaminobenzoyl-2-amino-5-naphthol-7-sulfonic acid.



i To all whoin'it may concern:

;obtained by condensing nitrobenztnll halm genids, such as ortho, paraorn'1eta-n1tro-' UNITED STATES PATENT OFFICE,

. AMINOBENZOYLAMINOBENZOYL-2-AMINO-5-NAPHTHOL-7 SULFONIC ACID.

9 94,420. No Drawing.

Specification of-Letters Patent.

I atented June 6, 1911. Application filed February 24,1911.

serial No. 610,505.

parts of molten' meta-nitrobenzoyl chlorid. The mixture is stirred at atemperature'of about 5060 C. for 2 hours, the condensatron product sfiltered off and is then introduced into a boiling mixture of 20 partsof iron filings, 500 parts of water and 1 part of acetic acid (80 percent).' After about one hour the reduction is complete; The iron isafter precipitation with sodium carbonate removed by filtration and thesodium salt of the new acid separates from the filtrate .aftertheaddition of so. much hydrochloric acid that the liquid is neutral tolit-mus. On addition of an. excess: of acid the free acid having theformula Be it known that I, .WILHELM- NEELMEIER, doctor of philosophy,chemist, citizen of the German Empire, residing at Leverkusen, nearCologne, Germany, have invented new and useful Improvements inAminobenzoylaminobenzoyl 2 Amino 5-Naphthol-7 Sulspecification.

My invention relates to the manufacture and production of compoundsvaluable for the production .of dyestuifs which can bebenzoyl-chlorid-withortho-, metaor'paraaniinobenzoyl 2 amino 5naphthol-Y-sub r e5 'fonic acidand by reducingthc condensation 1 H I-products thus obtained. These new prodnu go nets of the formula:

sogn NH.COCH...NH-COCGH.NH,

v separates.

. I claim.:-

. more fully the following split up into one molecule of The hereindescribed aminobenz'oylamino- I H, benzoyl 2amino-5-naphthol-7-sulfonicacids are distinguished by the remarkable prop Oilthe formula; city thatthey have the same affinityfor 800E HmNHn the fiber, as ,the so-calledsubstantive dyes a b a i and that they'ca'n be fixed von the fiber inithe same way as these colors. Cotton thus prepared can be combined withdiazo com- 8 0 which are after being dried and pulverized in the shapeof their alkaline salts whitish powders which are soluble in water; thenew compounds. can be fixed onthe fiber and combined with diazocompounds valuable shades being obtained; and'aresplit up'upon treatmentwith hot caustic soda into 2- amin'o-5-naphthol-7-sulfonic acid andamino' Inorderto illustrate the new process benzene carboxylic acid,substantially as de- .90

example is given, scribed. by weight :-A neutralsolw. In testimonywhereof I have hereunto set by dissolving 35.8 parts of my hand in thepresence of two subscribing pounds, or can be diazotized and combinedwith azodyestuii' components.

The new. products are aftcrbeing dried and pulverized in, the shape oftheir alkaline salt-s whitish powders soluble in-water, upon treatmentwith hot caustic alkali they are 2-amino-5- naphthol-7-sulfonic acid andinto two molecules of am-inobenzene carboxylic acid.

the parts being tion prepared metaaminobenzoyl--2-amino-5-naphthol-7w1tnesses.- 1 1 sulfonic acid in 500 parts of ,watereontain- WILHELMNEELMEIER. [1,. s.] 'ing 5.3 parts of sodium carbonate is heateditnesses: to 5060 0.; 14 "parts of crystallized so- HENKEL,

. .USCO.

dium acetate are added-to it and then 1.8.6;

